DH has just drove back from the gym and said while stationary at traffic lights, cars in the next lane were driving past and one scraped him. Nobody is injured but his rear car door has scratches along its entire length with some denting.
He doesn't have their number plate and they drove off. Neither of us have experienced something like this before. What on Earth happens next? (We are 30s, lived in London carless for a decade and recently moved to the country side and bought a car).